Blackberry and iPhones not synching with Exchange 2003 (Device Password)

Yesterday I received a request to set up a new iPhone user in an organisation.
All the account details were on the phone already and all accurate, it just wouldnt validate and connect.
Now I wasnt aware that there were already 2 iPhone users in the organisation working perfectly well.
I thought it was a setting on the Exchange server that needed to be changed. After a lot of googling I attempted to get the user set up.

On the Mobile Devices Properties in Exchange 2003, I ticked the box for Enforce Device Password in my haste.

I have received a call today that none of the mobile device users can connect to the Exchange.

I went to the offices and there was a Blackberry there for me to look at.
The emails stopped synching at basically the exact same time I was changing settings yesterday.

Please have a read through my Exchange 2003 / Activesync article which should help you to get your iPhone working.
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_1798-Exchange-2003-Activesync-Connection-Problems-FAQ.html

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